After years of seeing trek ships seeming to get smaller and smaller at merzo.net, I welcome larger ships.
After Narada, I imagine some scans of the tech and Spock primes warnings of Borg, etc Caused Starfleet to make ever larger ships.
I think Kelvin is perfect for a post NX-01 universe, where FJ/Jefferies ships followed a trek-verse with only Daedalus.
When I was growing up, Enterprise was the largest ship on screen. I won't be happy until I see one as long as a star destroyer or larger.